Is impersonation illegal?

It depends. Some states have laws that criminalize impersonating certain types of professionals or public figures (such as law enforcement, political officers, or lawyers) or criminalize impersonating another person with the intent to defraud someone (cheating/tricking someone out of something). However, even if impersonating you or someone else is not a crime under your state’s laws (if, for example, you do not fall under a protected category), the acts committed during the impersonation could be criminal. For example, if an abuser impersonates you to withdraw money from your bank account, s/he may be committing the crime of theft or fraud. If an abuser impersonates someone else in order to harass you, s/he may be committing the crime of harassment, and, if there is a restraining order in place, s/he may also be committing the crime of contempt.